# Ch 33 Physics

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question
Which of the following statements are true concerning compound microscopes?
answer
C)In a compound microscope, the final image is a virtual image. D)In a compound microscope, the image formed by the objective lens is a real image.
question
Which of the following statements are true concerning the eye?
answer
A)Nearsightedness can be corrected with a diverging lens. B)Astigmatism refers to a defect in which the surface of the cornea is not spherical. Instead, it is more sharply curved in one plane than another. D)The far point of the normal eye is infinity.
question
Which of the following statements are true concerning sign conventions for image formation?
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A)When the center of curvature of a spherical mirror is on the same side as the reflected light, the radius of curvature is positive; otherwise, it is negative. D)For an upright image, the magnification is positive; for an inverted image, the magnification is negative. E)When the object is on the same side of the reflecting or refracting surface as the incoming light, the object distance is positive; otherwise, it is negative.
question
Which of the following statements are true for images formed by thin lenses? of it.
answer
D)A diverging lens always produces an upright image of an object placed in front of it. F)A diverging lens always produces a virtual image of an object placed in front of it.
question
A Simple Magnifier To view an enlarged upright image of an object through a simple magnifier, where must the object be located?
answer
within the focal length of the lens, provided the focal length is shorter than the near point distance
question
A Simple Magnifier Two people, Micah and Lyra, with different near points are equally close to an object. Both inspect the object through the same magnifier by holding the lens close to the eye. Micah's near point is located farther away from his eye than Lyra's near point is located relative to her eye. Micah will experience a larger magnification for which of the following reasons?
answer
When the object is located at his near point, the angular size of the object is smaller for Micah than for Lyra. The angular size of the image relative to the angular size of the object at the near point is greater for Micah than for Lyra. M=25/f
question
Berenice, Chadwick and Edouard are nearsighted. The near point that is the smallest distance at which an object can be clearly seen by a normal eye is 25cm. The far point that is the largest distance at which an object can be seen clearly by a normal eye is ā. Nearsightedness can be corrected by diverging lenses, which form virtual images at the individual's far point when presented with objects at infinity.
answer
Which, if any, of these people are nearsighted (myopic)?
question
Bernice and Edouard have near point greater than 25cm and far point less than ā due to which they suffer both from myopia and hyperopia. Due to the reason mentioned above the listed people will require bifocals to correct vision. Farsightedness can be corrected by converging lenses, which form virtual images at the individual's near point when presented with objects at 25 cm. Bifocals include both converging and diverging lenses to correct for both farsightedness and nearsightedness.
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Which, if any, of these people require bifocals to correct their vision?
question
The near point that is the smallest distance at which an object can be clearly seen by a normal eye is 25cm. The far point that is the largest distance at which an object can be seen clearly by a normal eye is ā. A hyperopic eye can see far off things clearly but the near point for a hyperopic eye increases due to which it is greater than 25cm for that eye. From the table given Avishka and Francesca has farsightedness due to which their near point is greater than 25cm.
answer
Which, if any, of these people's vision can be corrected using only converging lenses?
question
Which are the components of a typical refracting telescope?
answer
a converging objective and a converging eyepiece Submit
question
Which of the following best describes the object being viewed by the telescope?
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The object is essentially infinitely far away.
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The location of the object to be viewed far away results in what sort of image?
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an image at the focal point of the objective This image then serves as the object for the eyepiece.
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Which answer best describes the image seen through the eyepiece of the telescope?
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a virtual and enlarged image
question
To form the virtual and enlarged images seen by the observer, the telescope should be designed so that the image formed by the objective falls where?
answer
slightly inside the focal length of the eyepiece The image distance from the objective is equal to the focal length of the objective. Since this image falls near the focal point of the eyepiece, the total length of the telescope is approximately equal to the sum of the two focal lengths.